Major League Baseball responded Wednesday to accusations leveled by Yankees third baseman Alex Rodriguez, who stormed out of the arbitration hearing at which he's appealing his 211-game suspension.

"For more than 40 years, Major League Baseball and the Players Association have had a contractual grievance process to address disputes between the two parties. This negotiated process has served players and clubs well. Despite Mr. Rodriguez being upset with one of the arbitration panel's rulings today, Major League Baseball remains committed to this process and to a fair resolution of the pending dispute," the statement read.

The tone was in sharp contrast to Rodriguez, who was upset that independent arbitrator Fredric Horowitz declined to call Commissioner Bud Selig to testify.

There is no precedent for Selig to appear at such a hearing, however.

"In the entire history of the Joint Drug Agreement, the Commissioner has not testified in a single case," MLB said in a second statement. "Major League Baseball has the burden of proof in this matter. MLB selected Rob Manfred as its witness to explain the penalty imposed in this case. Mr. Rodriguez and the Players Association have no right to dictate how Baseball's case is to proceed any more than Baseball has the right to dictate how their case proceeds. Today's antics are an obvious attempt to justify Mr. Rodriguez's continuing refusal to testify under oath."

Shortly after Rodriguez walked out of MLB's Park Avenue offices in New York, a statement was released through one of his publicists.

"I am disgusted with this abusive process, designed to ensure that the player fails," Rodriguez said. "I have sat through 10 days of testimony by felons and liars, sitting quietly through every minute, trying to respect the league and the process. This morning, after Bud Selig refused to come in and testify about his rationale for the unprecedented and totally baseless punishment he hit me with, the arbitrator selected by MLB and the Players Association refused to order Selig to come in and face me."

Rodriguez then appeared on WFAN with host Mike Francesa, who asked multiple times whether Rodriguez was guilty of any of the actions he is being accused of. Rodriguez, accompanied by one of his lawyers, repeatedly and unequivocally denied any guilt.

The Players Association also released a statement late Wednesday afternoon.

"The MLBPA believes that every player has the right under our arbitration process to directly confront his accuser. We argued strenuously to the Arbitrator in Alex's case that the Commissioner should be required to appear and testify. While we respectfully disagree with the Arbitrator's ruling, we will abide by it as we continue to vigorously challenge Alex's suspension within the context of this hearing."